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Factor XII Assay

Tube Type = Light Blue Top

Tube Type

Test ID LAB310
EPIC Order FACTOR 12 ACTIVITY
CPT Code(s) 85280
Group/Individual Test Individual
Laboratory Core Laboartory
Tube Station 30 Routine: 888 STAT
Specimen Routine: 2.7 mL Blood/Lt Blue Sodium Citrate tube; See Comments
Pediatric: 1.8 mL Blood Pediatric Lt Blue Sodium Citrate tube
Stability Unspun: 4 hours
Room Temperature: 4 hours
Refrigerated: NO
Frozen: 14 days (plasma only)
Availability Routine: Performed Mondays and Thursdays
STAT: YES
Turnaround Time Stat 90 minutes; Routine 3-4 days
Reference Range Normal: 60-171% of Normal
Critical: <10% of Normal
Comments
  • Deliver Immediately
  • If more than 2 Factor Assays are ordered: 2 Light Blue Top Tubes need to be drawn.
  • Draw tube must be allowed to fill completely.
  • Short draws will be rejected.

Reviewed by J. Carr on November 19, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514